Material Analysis
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MP product dimensional change during long-term storage
Fenómeno do problema
MP products after 3 months of storage have dimensional change ±2-3%, exceeding the ±0.5% requirement
Análise das causas
MP physical aging relaxation causes continuous dimensional change; secondary crystallization slowly changes density and dimensions; low molecular species slowly migrate changing local density
Solução
1) anneal products at 80°C/4h before leaving the factory to stabilize dimensions; 2) select high molecular weight grades to reduce low molecular species; 3) slight crosslinking to reduce molecular chain mobility and inhibit aging; 4) control storage environment temperature at 23±2°C to reduce temperature change effects
Conclusão principal
dimensional change is caused by physical aging; annealing and slight crosslinking are measures to stabilize dimensions
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